US 12,113,363 B2
Control of a renewable energy power plant to resume normal operation following a fault
Manoj Gupta, Jaipur (IN); Kouroush Nayebi, Ikast (DK); and Janakiraman Sivasankaran, Singapore (SG)
Assigned to VESTAS WIND SYSTEMS A/S, Aarhus N (DK)
Appl. No. 17/417,060
Filed by VESTAS WIND SYSTEMS A/S, Aarhus N (DK)
PCT Filed Nov. 28, 2019, PCT No. PCT/DK2019/050370
§ 371(c)(1), (2) Date Jun. 21, 2021,
PCT Pub. No. WO2020/125881, PCT Pub. Date Jun. 25, 2020.
Claims priority of application No. PA 2018 70845 (DK), filed on Dec. 20, 2018.
Prior Publication US 2022/0060020 A1, Feb. 24, 2022
Int. Cl. H02J 3/18 (2006.01); G05B 15/02 (2006.01); H02J 3/00 (2006.01); H02J 3/38 (2006.01); H02J 13/00 (2006.01)
CPC H02J 3/18 (2013.01) [G05B 15/02 (2013.01); H02J 3/004 (2020.01); H02J 3/381 (2013.01); H02J 13/00002 (2020.01); H02J 2300/22 (2020.01); H02J 2300/28 (2020.01)] 13 Claims
OG exemplary drawing
 
1. A method for operating a renewable energy power plant comprising a plurality of renewable energy generators, the method comprising:
operating a first reactive power controller to output a present reactive power reference level, the first reactive power controller configured to operate in a fault ride-through mode during a grid fault;
operating a second reactive power controller to output a target reactive power reference level, the second reactive power controller configured to operate following the grid fault in a normal operational mode as if the grid fault had not occurred;
calculating a rate of change of reactive power reference level for transitioning between the present reactive power reference level, and the target reactive power reference level, the target reactive power reference level being suitable for normal operation of the renewable energy power plant; and
following a fault on a power network to which the renewable energy power plant is connected, dispatching a control signal for controlling the renewable energy power plant to generate or consume reactive power at the calculated rate of change to transition a reactive power level of the renewable energy power plant to the target reactive power reference level.